package Example;
class  Student4{
    private String name;
    private int age;
    public String getName(){
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        if (age <= 0){
            System.out.println("你输入的年龄有误！");
        }else {
            this.age = age;
        }
    }
    public void read(){
        System.out.println("大家好,我是"+name+", 年龄"+age);
    }
}
public class Example04 {
    public static void main(String[] args) {
        Student4 stu = new Student4();
        stu.setName ("张三");
        stu.setAge (-18);
        stu.read ();
    }
}
